How long does a 100 w light bulb take to consume 13 kj?
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Answer:
130 hours
Explanation:
power of battery = 100w
energy consumed in 1 hour = 100 ×1 = 100j
by formula p=energy/t= work/time
let total hours consumed be x
therefore,
100 × x = 13kj
100 × x = 13000j
x = 13000/100 =130
answer is 130 hours
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